so far [英]səʊ fɑ:[美]soʊ fɑr

到目前为止;迄今为止;到这点为止; 仅到一定程度

[例句]So far ,the strategy has worked.

by far [英]bai fɑ:[美]baɪ fɑr

…得多; 更; 尤其;到目前为止

[例句]More important ,it will be by far the safest.

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